Where are your Raab's from?

I am looking for more info on Margaretta Raab b. 1863 Darmstadt, Germany d. 1933 in Dayton, Ohio.She married Wilhelm Rotterman in Dayton. Her brother Frederick who married Delfina Wilhelm and her sister Catharine also came to Dayton. As far as I know her parents Phillip Raab and Catharine Greenwald and a sister Elizabeth stayed in Germany.